Zhodnocení rentability a likvidity ve společnosti China Southern Airlines Company Limited

Import 05/08/2014China Southern Airlines Company Limited is one of the top companies in Chinese civil aviation industry which has the most quantity of transport airplanes, developed route network and maximum annual passenger volume in China, so the financial situation of the company is a representative of the industry. The goal of this thesis is to appraise the performance of China Southern Airlines Company Limited through two aspects: profitability and liquidity from 2008 to 2012 then compare it with other companies in civil aviation industry. From this thesis, we’ll see more detailed data analysis and the performance of this company, which will be helpful to acquaint the company.China Southern Airlines Company Limited is one of the top companies in Chinese civil aviation industry which has the most quantity of transport airplanes, developed route network and maximum annual passenger volume in China, so the financial situation of the company is a representative of the industry. The goal of this thesis is to appraise the performance of China Southern Airlines Company Limited through two aspects: profitability and liquidity from 2008 to 2012 then compare it with other companies in civil aviation industry. From this thesis, we’ll see more detailed data analysis and the performance of this company, which will be helpful to acquaint the company.154 - Katedra financívýborn

Aplikace Matlabu v optimalizaci portfolia

Import 02/11/2016Stock portfolios are estimated to diversify the risk in the financial market. When we invest in portfolios of stocks, we need to find the optimal portfolios with high expected return and low risk. Therefore, it is necessary to know which strategy performs the best and choose correct strategy to invest. The goal of this thesis is to apply different portfolio optimization strategies and to compare their out-of-sample results. In this thesis, we apply different strategies to calculate the weights of stock portfolios, and apply back testing method to obtain the returns and wealth of portfolios, then compare the performance of different strategies by Sharpe ratio and Maximum drawdown.In compliance with the results of all strategies that used, we make the ranking of the performance for these strategies, and choose which is the best strategy to invest.Stock portfolios are estimated to diversify the risk in the financial market. When we invest in portfolios of stocks, we need to find the optimal portfolios with high expected return and low risk. Therefore, it is necessary to know which strategy performs the best and choose correct strategy to invest. The goal of this thesis is to apply different portfolio optimization strategies and to compare their out-of-sample results. In this thesis, we apply different strategies to calculate the weights of stock portfolios, and apply back testing method to obtain the returns and wealth of portfolios, then compare the performance of different strategies by Sharpe ratio and Maximum drawdown.In compliance with the results of all strategies that used, we make the ranking of the performance for these strategies, and choose which is the best strategy to invest.154 - Katedra financívýborn

Design and Evaluation of Approximate Logarithmic Multipliers for Low Power Error-Tolerant Applications

In this work, the designs of both non-iterative and iterative approximate logarithmic multipliers (LMs) are studied to further reduce power consumption and improve performance. Non-iterative approximate LMs (ALMs) that use three inexact mantissa adders, are presented. The proposed iterative approximate logarithmic multipliers (IALMs) use a set-one adder in both mantissa adders during an iteration; they also use lower-part-or adders and approximate mirror adders for the final addition. Error analysis and simulation results are also provided; it is found that the proposed approximate LMs with an appropriate number of inexact bits achieve a higher accuracy and lower power consumption than conventional LMs using exact units. Compared with conventional LMs with exact units, the normalized mean error distance (NMED) of 16-bit approximate LMs is decreased by up to 18% and the power-delay product (PDP) has a reduction of up to 37%. The proposed approximate LMs are also compared with previous approximate multipliers; it is found that the proposed approximate LMs are best suitable for applications allowing larger errors, but requiring lower energy consumption and low power. Approximate Booth multipliers fit applications with less stringent power requirements, but also requiring smaller errors. Case studies for error-tolerant computing applications are provided

Influence of Different Phenolic Fractions on Red Wine Astringency Based on Polyphenol/Protein Binding

The presence of phenolic compounds can make a great contribution to the perception of astringency in red wines based on their interactions with proteins. Human salivary protein and bovine serum albumin were used in this study to investigate the relationship between astringency and polyphenol composition.  The interactions between polyphenols and proteins were analysed by means of electrophoresis and fluorescence spectra, and they were further confirmed by sensory analysis. The results indicate that a positive correlation existed among the percentage of polymeric proanthocyanidins and the total phenols.  Additionally, astringent wine was generally identified as having a high percentage of polymeric fragments.  In comparison with other fractions, polymeric fractions exhibited the highest affinity for protein, and thus the highest astringency

チュウゴクゴ ドウシ メイシ コロケーション サンシュツ テスト カイハツ ノ ココロミ JSL ノ コドモ ノ ボゴ ケイショウゴ デノ チョウサ ニ ムケタ パイロットテスト

本稿は、西川・青木（2018）の日本語の名詞・動詞コロケーションテストの中国版を試作し、中国語母語話者（成人）15名と日本語を母語とする中国語学習者（高校生・成人）21名を対象に実施したパイロット調査の報告である。本研究の最終的な目的は、日本在住の日本語を第二言語とする子ども（JSL の子ども）を対象に、日中二言語でコロケーションテストを実施することである。本稿でのパイロット調査の結果、日本語版をもとに作成した中国語版70 アイテムのうち、中国語母語話者の正答率が低いアイテムが14 アイテムあった。正答率が低いアイテムとしては、日本語から中国語に置き換えるのが難しい自動詞アイテムのように、語彙化や翻訳語の問題に関わる例も見られた。また、中国語学習者の誤答には、母語である日本語からの転移とみられる例もあった。これらの結果をもとに、コロケーションの知識を日中二言語で測るテストの可能性と課題を検討する。In this article, we developed a Chinese version of the Japanese“ verb & noun” collocation test by Nishikawa and Aoki (2018) and piloted the Chinese test with 15 native speakers of Chinese (adults) and 21 Japanese learners of Chinese (high school students and adults). Our study ultimately aims to investigate collocational knowledge both in Japanese and Chinese among children who live in Japan and speak Japanese as a second language (JSL children). The results of this pilot study show that among the 70 items in the Chinese test, which were developed based on the Japanese version, 14 items showed low accuracy rates among native speakers of Chinese. Some of these cases appeared to be related to lexicalization and translation problems, such as intransitive-verb items that were difficult to translate from Japanese to Chinese. Additionally, some of the Chinese learners’ errors were considered negative transfers from their first language; Japanese. Based on these results, we discuss the possibilities and challenges of developing bilingual tests that measure collocational knowledge in Japanese and Chinese.研究ノートResearch Note

Core-shell gold-nickel nanostructures as highly selective and stable nonenzymatic glucose sensor for fermentation process

Non-enzymatic electrodes based on noble metals have excellent selectivity and high sensitivity in glucose detection but no such shortcomings as easy to be affected by pH, temperature, and toxic chemicals. Herein, spherical gold-nickel nanoparticles with a core-shell construction (Au@Ni) are prepared by oleylamine reduction of their metal precursors. At an appropriate Au/Ni ratio, the core-shell Au@Ni nanoparticles as a sensor for glucose detection combine the high electrocatalytic activity, good selectivity and biological compatibility of Au with the remarkable tolerance of Ni for chlorine ions (Cl-) and poisoning intermediates in catalytic oxidation of glucose. This electrode exhibits a low operating voltage of 0.10 V vs. SCE for glucose oxidation, leading to higher selectivity compared with other Auand Ni-based sensors. The linear range for the glucose detection is from 0.5 mmol L-1 to 10 mmol L-1 with a rapid response time of ca. 3 s, good stability, sensitivity estimated to be 23.17 mu A cm(-2) mM(-1), and a detection limit of 0.0157 mM. The sensor displays high anti-toxicity, and is not easily poisoned by the adsorption of Cl- in solution

Symbiont shuffling dynamics associated with photodamage during temperature stress in coral symbiosis

Reef-building corals usually form a symbiotic relationship with various photosynthetic dinoflagellates, which may determine the physiology and stress tolerance of their hosts. The mechanisms governing symbiont dynamics are still poorly understood, but may be driven by temperature. Therefore, we performed indoor experiments to examine the photochemical efficiency and symbiont dynamics in the coral Pocillopora damicornis with thermo-sensitive Cladocopium (PdC) or thermo-tolerant Durusdinium (PdD) under 6-day temperature stress and after 90-day post-stress recovery. Regardless of the symbiont type, photochemical damage was induced by both heat and cold stress. We observed PdC with greater photodamage had a faster increase in the proportion of Durusdinium when exposed to heat or cold stress, whereas an inverse shuffling to Cladocopium in both PdC and PdD after the recovery period. This is the first record of symbiont shuffling from the originally dominant Durusdinium to Cladocopium in adult corals under laboratory conditions and the degree of symbiont shuffling was highly correlated with the photodamage. Overall, our findings suggest that symbiont shuffling can act as a critical mechanism allowing corals to rapidly adjust to environmental changes, which has implications for the capacity of corals to prevail in oceans with greater temperature fluctuations in the future

Convenient isolation of strictinin-rich tea polyphenol from Chinese green tea extract by zirconium phosphate

Zirconium phosphate (ZrP) was prepared and employed to separate strictinin-rich tea polyphenol from Chinese green tea extracts. The influences of ZrP calcination temperatures, green tea extraction conditions, and the amounts of ZrP on the isolation of strictinin-rich tea polyphenol were evaluated; the absorption and desorption dynamics of strictinin on ZrP were also determined. Our results revealed that the HPLC content of strictinin increased from 4.96% in 70% ethanol extract of green tea to 58.2% in isolated strictinin-rich tea polyphenol obtained by ZrP-900 (ZrP calcined at 900°C). Furthermore, the suitable time for both strictinin absorption and desorption was 4 hours at 37°C. The method developed here consisted of easy steps such as ZrP absorption, water washing, and 0.4% phosphoric acid solution desorption, which may facilitate the detection and isolation of strictinin from different samples